Mileage Plan members flying British Airways nonstop service between Seattle and London can earn double miles on travel through June 15, 2014.
Members must first register for the promotion HERE
Double miles offer is valid only on qualifying British Airways nonstop flights through June 15, 2014 between Seattle (SEA) and London (LHR).
Flight miles must be credited to your Alaska Airlines Mileage Plan account in order to earn double miles. Double miles will not count towards Mileage Plan elite status. Flights must be flown in A, B, C, D, E, F, G, H, I, J, K, L, M, O, Q, R, S, T, V, W, or Y class of service.